test: Make error message more helpful
test: Make error message more helpful

Downloading a directory from a test machine should mention
the directory it was supposed to download in the error message.

Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

moraleslazaro/cockpit,jscotka/cockpit,arilivigni/cockpit,garrett/cockpit,michalskrivanek/cockpit,deryni/cockpit,matobet/cockpit,larsu/cockpit,mvollmer/cockpit,vanloswang/cockpit,xhad/cockpit,larsu/cockpit,dperpeet/cockpit,vanloswang/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,cockpit-project/cockpit,dperpeet/cockpit,vanloswang/cockpit,andreasn/cockpit,mareklibra/cockpit,dperpeet/cockpit,moraleslazaro/cockpit,xhad/cockpit,cockpituous/cockpit,harishanand95/cockpit,andreasn/cockpit,sgallagher/cockpit,martinpitt/cockpit,Scribery/cockpit,cockpit-project/cockpit,dperpeet/cockpit,sgallagher/cockpit,Scribery/cockpit,garrett/cockpit,mareklibra/cockpit,cockpit-project/cockpit,jscotka/cockpit,deryni/cockpit,sgallagher/cockpit,stefwalter/cockpit,harishanand95/cockpit,andreasn/cockpit,xhad/cockpit,andreasn/cockpit,arilivigni/cockpit,mvollmer/cockpit,cockpituous/cockpit,petervo/cockpit,harishanand95/cockpit,Scribery/cockpit,harishanand95/cockpit,arilivigni/cockpit,michalskrivanek/cockpit,mareklibra/cockpit,larskarlitski/cockpit,mvollmer/cockpit,deryni/cockpit,vanloswang/cockpit,xhad/cockpit,andreasn/cockpit,martinpitt/cockpit,stefwalter/cockpit,moraleslazaro/cockpit,petervo/cockpit,xhad/cockpit,mareklibra/cockpit,stefwalter/cockpit,arilivigni/cockpit,xhad/cockpit,dperpeet/cockpit,larsu/cockpit,vanloswang/cockpit,sgallagher/cockpit,petervo/cockpit,SotolitoLabs/cockpit,cockpit-project/cockpit,dperpeet/cockpit,arilivigni/cockpit,larskarlitski/cockpit,petervo/cockpit,larskarlitski/cockpit,mareklibra/cockpit,garrett/cockpit,cockpituous/cockpit,xhad/cockpit,michalskrivanek/cockpit,cockpituous/cockpit,deryni/cockpit,jscotka/cockpit,mareklibra/cockpit,mvollmer/cockpit,sgallagher/cockpit,michalskrivanek/cockpit,SotolitoLabs/cockpit,larskarlitski/cockpit,mareklibra/cockpit,petervo/cockpit,andreasn/cockpit,matobet/cockpit,michalskrivanek/cockpit,larskarlitski/cockpit,garrett/cockpit,martinpitt/cockpit,Scribery/cockpit,stefwalter/cockpit,deryni/cockpit,harishanand95/cockpit,moraleslazaro/cockpit,Scribery/cockpit,harishanand95/cockpit,SotolitoLabs/cockpit,matobet/cockpit,petervo/cockpit,moraleslazaro/cockpit,larskarlitski/cockpit,cockpituous/cockpit,garrett/cockpit,jscotka/cockpit,deryni/cockpit,arilivigni/cockpit,sgallagher/cockpit,martinpitt/cockpit,vanloswang/cockpit,larsu/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,petervo/cockpit,stefwalter/cockpit,michalskrivanek/cockpit,martinpitt/cockpit,vanloswang/cockpit,deryni/cockpit,harishanand95/cockpit,stefwalter/cockpit,stefwalter/cockpit,cockpituous/cockpit,larskarlitski/cockpit,sgallagher/cockpit,cockpit-project/cockpit,dperpeet/cockpit,Scribery/cockpit,larsu/cockpit,moraleslazaro/cockpit,matobet/cockpit,mvollmer/cockpit,Scribery/cockpit,jscotka/cockpit,andreasn/cockpit,arilivigni/cockpit,jscotka/cockpit,larsu/cockpit,SotolitoLabs/cockpit,matobet/cockpit,matobet/cockpit,michalskrivanek/cockpit